Nominal efficiency of the Sine 18 was 75%, but you have to take account of the partly wasted heat input of the permanent pilot and standing losses from air circulation through the large balanced flue, so maybe 70%? I doubt if www.boilers.org.uk bother to do a calculation for such an old boiler.garethgas said:
sine 18 diaphragm
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I would have expected the efficiency to be around 82% based on its design and constant firing. However the PP and open flue will reduce its seasonal efficiency and perhaps the 75% takes that into account!
The oldest one I have seen is about 25 years but the number is a bit different and its an open vertical flue instead of a balanced one. Almost all I see are about 1986/87 perhaps BG were installing them then.
If the wax capsule has lasted 20 years then I dont see that as poor engineering when the boiler was probably only expected to last 20 years.
Tony
The oldest one I have seen is about 25 years but the number is a bit different and its an open vertical flue instead of a balanced one. Almost all I see are about 1986/87 perhaps BG were installing them then.
If the wax capsule has lasted 20 years then I dont see that as poor engineering when the boiler was probably only expected to last 20 years.
Tony
Oldest one I still look after is from 1982 - still going strong.
Half the Juniors I installed a couple of years ago have developed leaks around the pump unions. I changed a 24i PCB this week - the flame sense was playing up after 18 months (it had also had a warranty callout from Worcester to repair a leek).
Half the Juniors I installed a couple of years ago have developed leaks around the pump unions. I changed a 24i PCB this week - the flame sense was playing up after 18 months (it had also had a warranty callout from Worcester to repair a leek).
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The 28i junior isnt condensing or are you talking about the new greenstar junior?
I also happen to think after working on Sine 18s for 17 years that they were and still are a good boiler.
Very often slated by those who misunderstood them.
I always check the wax capsule with a simple check of the preheat facility and watching the flag. Early diagnosis of no preheat can avert bigger problems when the capsule or more to the point a seized push rod stops completely.
Stan
I also happen to think after working on Sine 18s for 17 years that they were and still are a good boiler.
Very often slated by those who misunderstood them.
I always check the wax capsule with a simple check of the preheat facility and watching the flag. Early diagnosis of no preheat can avert bigger problems when the capsule or more to the point a seized push rod stops completely.
Stan
No it doesn't. The 75% figure is based on its input (26 kW) and output (19.5 kW) as stated in the MIs. I was surprised that it wasn't around 80% too. The Sine 18 is the balanced flue version of the early VCW T3 Ws. The other two were open flue models, the 20/1 and the 25/1.Agile said:
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